Toolholder fob lathes



INYENTOR Ill L O. L c/umcuvv ATTORNEY April 17, 1951 Filed Jan. 25, 1947 55:3 lilllllllllll April 17, 1951 E. o. LEHMANN TOOLHOLDER FOR LATHES Filed Jan. 23, 1947 2 Sheets-Sheet 2 o INVENTOR Ercch L ch17 mpg;

BY l JAM ATTORNEY Patented Apr. 17, 1951 UNITED STATES PATENT OFFICE 2,549,493 TOOLHOLDER FOR LATHES Erich 0. Lehmann, Verona, N. J. Application January 23, 1947, Serial No. 723,860

3 Claims.

This invention relates to improvements in tool holders for lathes, theprincipal object of the invention being to provide a device of this character by means of which the tool is always held straight and can be set at the exact center line of the work regardless of what toolis being used.

A further object of the invention is to provide a tool-holder having embodied therein a compound block which may be substituted in place of the usual lathe compound for turning larger stock.

A further object is to provide a tool-holder by means of which the tools can be turned at any angle to each other to give more room between them, and which is capable of adjustment to accommodate tools of various sizes and shapes.

Other objects and advantages of the invention will appear as the description proceeds.

In the drawing accompanying this. specification,

Fig. l is a partly sectional plan view of a double tool-holder constructed in accordance with the present invention and showing a pair of cutting tools secured therein;

Fig. 2 is a vertical sectional view taken approximately on the line 2-2 of Fig. 1;

Fig. 3 is a partly sectional end view of the tool-holder shown in Figs. 1 and 2;

Fig. 4 is a partly sectional plan View of a single tool-holder constructed in accordance with the present invention, showing the same mounted on the tool-carrier of a lathe, the latter being shown in dotted lines;

Fig. 5 is a vertical sectional view taken approximately on the line 5-5 of Fig. 4;

Fig. 6 is a bottom plan view of the tool-holder proper looking in the direction of the arrows in Fig. 5; and

Fig. 7 is a perspective view of a slide member forming part of the tool-holder assembly.

Referring to the drawings, 8 designates a cylindrical base block which may properly be termed an adapter because it may be substituted in place of the usual compound rest of the lathe for turning larger stock, said block being provided with a central opening 9 and two diametrically opposite openings ID by means of which it may be centered on and secured to the tool carriage of a lathe.

Formed in the upper portion of the base 8 is a guideway I I of inverted T-shape extending diametrically across the said base for the reception of a slide [2 on which is mounteda tool-carrier supporting block [3, said block being securedto the slide 12 by means of bolts l4 countersunk in the block and threaded in the slide. At opposite corners at one side thereof the block I3 is formed with a pair of tubular extensions l3 and 13 for the reception of the tool-holders proper, eachof said tubular extensions being split as shown at [5 in Fig. 1 and having a thickened portion l6 and I1 respectively adjacent one wall of the split, said thickened portion being free to move toward the opposite wall of the split thereby to clamp the tool holders proper hereinafter described in position in the tubular extensions. For operating the tubular extension shown at the right of Fig. l, the thickened portion 16 thereof is provided with an interiorly threaded opening extending in a direction tangential to the tubular extension, said opening being engaged by the threaded end of a long bolt l8 which passes through the block 13 from the opposite side of said block also in a direction tangential to the tubular extension. For operating the tubular. extension at the left of Fig. l, a shorter bolt I9 passes freely through an opening in the thickened portion I! and into threaded engagement with an opening in the block [3, as indicated at 20.

Each of the tool-holders proper comprises a pair of tubular members or posts 2| and 22, one telescoping within the other and each having a fixed radially extending jaw 23 and 24 respectively. The exterior diameter of the posts 2! is such that they fit snugly into the tubular extensions l3 and [3 while the diameter of the posts 22 is such that they fit snugly within the outer tubular posts 2|, it beingunderstood that said posts are intende-dto be interchangeable. It will thus be seen that the posts 22 can be moved telescopically of the posts 2! so as to provide a smaller or larger opening between the jaws 23 and 24, the width of such opening being controlled by a bolt 25 which passes longitudinally through the inner post 22 and is threaded into an opening in the base of the outer post 2i as indicated at 26 in Fig. 3. For securely holding tools of different sizes in fixed position the jaws 23 and 24 are provided in their opposing. faces with grooves or channels 21, 28 of diiierent widths extending transversely of the jaws whereby a thin tool may be placed either with its fiat side within the wider groove or with its thin edges in the narrower grooves and when clamped between the jaws in either position is solidly and immovably held.

The heads of all of the bolts herein described are preferably provided with hexagonal or other angular depressions as indicated at 29, Figs. 1

and 3, forming sockets for the reception of a wrench.

The mechanism shown in Figs. 4 to 7 is generally the same as that above described, with the exception that it provides for only a single toolholder and additional means is provided for retaining the tool-supporting block in any adjusted angular position with relation to the .base member. In these figures the base 8 is identical in construction to that above described, as are also the telescoping tool posts 2|, 22 and their jaws 23 and 24. The tool-supporting block is however, provided with a single tubular extension 30 having a thickened portion 3! which is in thread ed engagement with a bolt 32 passing through the tool-supporting block in the same manner ashereinbefore described. In this embodiment the tool-supporting block is secured to the slide 33 by a central bolt 3i passing freely through the block and threaded into said slide, and said block is provided at its underside with a plurality of holes 35 disposed in circular arrangement for engagement with a pair of pins or dowels 36 extending from the top surface of the slide 33 whereby said dowels will enter two diametrically opposite holes in the tool-supporting block at whatever angle the block may be rotated around its central pivot bolt 34, whereby the supporting block is rigidly maintained at any position of angular adjustment.

From the foregoing it will be seen that in either form of the device the tool-holder can be readily adjusted to an desired angle to the work and solidly clamped in such position. Moreover, in the use of the double tool support the tools can be adjusted to any desired angle to each other as Well as to the work.

The: double tool-holder herein described possesses: great advantages-in the production of setup combinations, since the materials which pass 2 over the top of the base member can be machined from both sides, while the single tool-holder,

with its center opening for the clamping screw and the dowel-hole arrangement for positively retaining it at any angular position in" a horizontal plane is particularly well adapted for general and tool-room work, and in both forms the top of the base member provides a convenient surface for laying out work of diiferent types While still in the lathe. Moreover, different forms of channels may be milled into the opposing faces of the jaws for the accommodation of cutter bits. of various sizes and shapes so that the bits may be held more securely at the correct cutting. center,. and changes can be made in a matter of seconds.

It isv to be understood that many mechanical variations. may be made in the details. of construction herein described without departing from the spirit and scope of the invention as set forth in the claims appended hereto.

Having thus described my invention, What I claim is:

l. A tool-holder for lathes comprising a base member, a member mounted for sliding movement in said base member, a tool-supporting block removably secured to said slidable member, a pair of split tubular members integral with said block, a pair of toolposts mounted in said tubular members for vertical and angular adjustment relative to the block, and means for clamping said split tubular members around said tool' posts thereby to maintain the posts at any adjusted position.

2. A tool-holder for lathes, comprising a cylindrical base block adapted to be centered on and secured to the tool carriage of a lathe, said base block having a diametrically extending guideway formed therein, a member mounted for horizontal sliding movement in said guideway, a toolsupporting block mounted on said base block and releasably secured to said slidable member, said tool-supporting block having at one side edge thereof a pair of holding members for releasably securing a pair of tool posts in any angular position in a' horizontal plane in relation to each other and to the tool-supporting block, and means for releasing said holding members from said' tool posts.

3. A tool-holder for lathes, comprising a base block, a tool-supporting block mounted for sliding and rotary movements in a horizontal plane above said base block, said tool-supporting block having asplit tubular member integral therewith for' the reception of a tool post and means for drawing the split portions of said member toward each other thereby. to exert clamping pressure on. a: tool post carried by said tubular member, a horizontally slidable member disposed in said base block below said tool-supporting block, said slidable member and tool-supporting block having. cooperating means for preventing rotary movement of the tool-supporting block, and means for releasably securing the tool-supporting block to said slidable member.

ERICH O". LEHMANN.

REFERENCES- CITED Thefollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 904,579 Vogel Nov. 24,1908 1,222,178 Browan'd Apr. 10, 1917 1,779,189 Russell Oct. 21,1930 2,170,246 Kleiner Aug. 22, 1939 2,375,572 Lustrik Dec. 19, 1944 

